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While the optical displacement measurement methods have achieved the picometer precision, the latter is considered elusive for the fabrication methods. The Surface Nanoscale Axial Photonics (SNAP) platform allows to fabricate ultralow loss optical microresonators and resonant circuits at the surface of an optical fiber with the remarkable subangstrom precision. Here, we describe recently proposed SNAP optical signal processors, frequency comb generators, microwave photonic filters, and optical sensors with important potential applications which successful realization requires the picometer fabrication precision. We discuss the developed and potential approaches towards the achievement of this challenging goal.
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